def obj_sha(type, chunks):
"""Compute the SHA for a numeric type and object chunks."""
sha = make_sha()
sha.update(object_header(type, chunks_length(chunks)))
for chunk in chunks:
sha.update(chunk)
return sha.digest()
def iter_sha1(iter):
"""Return the hexdigest of the SHA1 over a set of names.
:param iter: Iterator over string objects
:return: 40-byte hex sha1 digest
"""
sha1 = make_sha()
for name in iter:
sha1.update(name)
return sha1.hexdigest()
def sha(self):
"""The SHA1 object that is the name of this object."""
if self._sha is None or self._needs_serialization:
# this is a local because as_raw_chunks() overwrites self._sha
new_sha = make_sha()
new_sha.update(self._header())
for chunk in self.as_raw_chunks():
new_sha.update(chunk)
self._sha = new_sha
return self._sha
def sha(self):
"""The SHA1 object that is the name of this object."""
if self._sha is None or self._needs_serialization:
# this is a local because as_raw_chunks() overwrites self._sha
new_sha = make_sha()
new_sha.update(self._header())
for chunk in self.as_raw_chunks():
new_sha.update(chunk)
self._sha = new_sha
return self._sha
def __init__(self, read_all, read_some=None):
self.read_all = read_all
if read_some is None:
self.read_some = read_all
else:
self.read_some = read_some
self.sha = make_sha()
self._offset = 0
self._rbuf = StringIO()
# trailer is a deque to avoid memory allocation on small reads
self._trailer = deque()
def calculate_checksum(self):
"""Calculate the checksum for this pack.
:return: 20-byte binary SHA1 digest
"""
s = make_sha()
self._file.seek(0)
todo = self._get_size() - 20
while todo > 0:
x = self._file.read(min(todo, 1<<16))
s.update(x)
todo -= len(x)
return s.digest()
def calculate_checksum(self):
"""Calculate the SHA1 checksum over this pack index.
:return: This is a 20-byte binary digest
"""
return make_sha(self._contents[:-20]).digest()
def __init__(self, f):
self.f = f
self.sha1 = make_sha("")
def _make_sha(self):
ret = make_sha()
ret.update(self._header())
for chunk in self.as_raw_chunks():
ret.update(chunk)
return ret
def _make_sha(self):
ret = make_sha()
ret.update(self._header())
for chunk in self.as_raw_chunks():
ret.update(chunk)
return ret
